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利用α径迹技术在鲜水河断裂的虾拉沱形变场地内进行土壤氡浓度变化的观测试验,两年多来的资料表明:氡浓度变化与气象参数变化有密切的相关性,氡含量有明显的夏高冬低的年周变化规律;土层中钍射气(~(220)Rn)能造成探片明显干扰,钍射气在6～8月间活动能力最强;断层带上的测孔比偏离断层测孔氡含量高,变化幅度大;断层带上的测孔氧含量变化与炉霍、道孚、甘孜一带小震活动似有一定对应关系。本文提出了一种氡载气流运移模式,可获得震前土壤氡明显前兆变化,但观测孔应满足构造条件、运移条件、氡物质来源条件。此外该技术能确定隐伏断层位置和走向以及断层活动性,为地震地质研究提供依据。
Observations of soil radon concentration in the shrimp pullout deformation site of Xianshuihe fault were conducted by means of α-track technique. The data of two years have shown that there is a close correlation between the change of radon concentration and the variation of meteorological parameters. (~ (220) Rn) in the soil can cause significant interference with the probe, and thoron-strontium has the strongest activity in June-August; The ratio of measured borehole deviations from the measured borehole radon content is high and the variation range is large. The variation of measured pore oxygen content on the fault zone seems to correspond to the small earthquakes in Luhuo, Daofu and Ganzi areas. In this paper, a model of radon carrier gas migration is proposed, which can obtain obvious precursory change of soil radon before the earthquake, but the observation hole should meet the conditions of construction, migration and source of radon. In addition, the technique can determine the location and direction of the buried fault and the fault activity, and provide the basis for the study of the seismic geology.